Rotary take-up for sewing machines



March 23, 1943. F. PARRY 2,314,513

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Patented Mar. 23, 1943 2.314.513 ao'rnnr TAKE-UP ron snwmc MACHINES Frank Parry, Bridgeport, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey 1 Application October 10, 1941, Serial No. 414,437

v 16 Claims.

This invention relates to a sewing machine and more particularly to a sewing machine take-up which acts to control the amount of thread supplied to the stitching instrumentalitles during the stitch-forming cycle. 1

One of the objects of this invention is to provide a rotary take-up having a plurality of take-up 'elements which rotate at a uniform angular will hereinafter appear, the invention comprises,

the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Fig. 1 is a vertical section taken through a sewing machine having my improved take-up embodied therein.

Fig. 2 is a horizontal section taken through the bracket-arm of the machine, the driving mechanism for the take-up elements being shown in elevation.

Fig. 3 is a left end elevation of the machine I showing the position of the take-up elements when the needle is at the bottom of its stroke.

Fig. 4 is a view similar to Fig. 8 showing the position of the take-up elements just prior to the point in the cycle when the hook casts off the needle-thread loop.

Figs. 5 and 6 are views similar to Fig. 3. Fig. 5 showing the position of the take-up elements'immediately after the needle-thread loop has been cast off by the hook and Fig. 6 illustrating the position of th elements at the stitch setting point.

Fig. 7 is a front elevation of a sewing machine embodying a modification of the invention shown in Figs. 1 to 6, part of the frame of the machine being shown in section to expose the operating parts within the bracket-arm and hollow-head.

Fig. 8 is a horizontal section taken through the bracket-arm of the machine shown in Fig. 7.

Fig. 9 is an enlarged detail view of one end of the take-up shafts.

Fig. 10 is a left end elevation of the machine shown. in Fig. 7.

Fig. 11 is a left end elevation showing the location of the take-up elements at the stitch. setting point in the cycle.

In the embodiment of the invention selected for illustration the invention is applied to a sewing machine having a frame comprising a bed Ill. a standard I l and an overhanging bracket-arm l2 terminatingin a hollow head l3. Journaled in the bearings I4 and IS in the bracket-arm is a shaft it having a driving pulley ll fixed to one of its ends. 'Journaled beneath the bed and operatively connected to the shaft It by the belt l8 and pulleys l9 and 2|] is a shaft 2| which rotates at the same speed as the shaft l6 and carries feed actuating eccentrics 22 and an internal gear 23 meshing with a spur gear 24 fixed to one end of a'hook-shaft 25. The ratio of the gears 23 and 24 is as 1 is to 2 and, therefore, the shaft 25 makes two complete rotations for each rotation of the shafts 2| and IS.-

The shaft 25 is journaled in bearings 26 located beneath the bed and a hook 21 having a loop-' seizing beak 28 is fixed to the outwardly extending end of the shaft 25. The hook 21 cooperates with a needle 29 fixed to a needle-bar 30 which is reciprocated by the shaft l6 by means of th crankdisk 34, crank-pin 3i and link 32. The stitchforming mechanism of the above described machine is all old andw-ell known and is ful y described in the patent to'Sidney Zonis, No. 2,267,- I

581, dated Dec. 23, 1941, to which reference may be had for a more detailed description.

In the embodiment shown, my improved takeup-comprises a circular disk which i fixed by the screws 36 and stud 31 to the enlarged end 38 of the crank-pin 3|. Th disk 35 is fixed to the crank-pin 3| so that the center of the disk coincides with the center of the shaft 16 and, therefore, the disk 35 and shaft l6 rotate about a common axis and at a uniform angular velocity. Fixed to the disk 35 is a stud or take-up element 39 which is adapted to engage the needle-thread, and a ring of thin sheet metal 40 is secured tot-he stud 39 to confine the needle-thread so that it will be engaged by the stud 39 during the stitch-formin'F-i cycle.

Fixed to the shaft 16 adjacent the pulley i9 is a gear ll meshing with a gear 42 fixed to one end of a shaft 43 journaled in the bearings 44 carried by the bracket-arm l2. The ratio of the gears 41 and 42 is as 1 is to 1 and, therefore, the

, shaft 49 rotates once for each rotation of the shaft l8 and in the opposite direction.

Adjustably fixed to the other end of the shaft 43 by means of the hub 48 and set screw 4'! is a disk 48 having a stud or take-up element 49' fixed thereto. A ring 58 is fixed to the stud 49 to confine the needle-thread within the space between the ring 58 and disk 48 so that it will be engaged by the stud 49 during the stitching cycle. A closure plate 52 (Fig. l) is secured to the guiding groove 55 in its upper end and fixed to the block 54 is a guard plate 58. The machine is provided with the usual feeding'mechanism comprising a presser-bar 51 carrying a presserfoot 58 cooperating with a feed-dog 59 carried by a'feed-bar 68 actuated through the rockshafts iii and 82 by the feed-actuating eccentries 22 carried by the shaft 2 I.

The operation or my improved form of takeup is as follows: The lead of the needle thread N is from the supply spool through the tension 65, under the guide 68, which is carried in the usual way by the presser-bar 51, between the disk 48 and ring 50 through the slot 55 in the block 54, between the disk 35 and ring 40, to the right of the pin 88 which is carried by the late 52, through the guides 89 and 18 and thence to the eye of the needle 29. Assuming the parts to be in the position shown in Fig. 3. the needle at this point has reached the end of its downward movement and has started its upward movement and thrown out a needle-loop which the beak 28 of the hook has Just entered. At

this point in the cycle the take-up elements.

. and the take-up elements have given up the maximum amount of thread. The position of the take-up elements illustrated in Fig. 5 show that the elements 39 and 49 have moved away from each other and therefore produced a tension on the needle-thread which causes the needie-loop to slip off the end of the'hook beak. The take-up elements 39 and 49 continue their movement just prior to the stitch setting point, and it will be noted that the take-up element 49 is now moving away from the guide 89 and the take-up element 39 is moving away from the needle 29 and the take-up elements 39 and Here moving away from each other, the resultant of these three motions is a quick-take-up action on the needle thread. At the stitch setting point in the cycle, illustrated in Figure, 6, the maximum amount of thread has been taken up by the elements to set the stitch. It will be observed that at this point in the cycle the element 49 is moving away from guide 89 and the element 39 away from the needle and at the same time the elements 99 and 49 are moving towards each other. These relative movements provide a gradual take-up action on the needlethread at this point in the cycle as the movements of the take-up elements away from the guide 88 and needle 29 and at the same time the movement of the elements towards each other produces actions, the resultant of which is a slow and even pull on the needle thread to a shaft which extends through and is arranged with its axis coincident with the tubular shaft I9. The hub of the gear 83 is offset to provide a space for a ball bearing 88 the outer race of which fits'tightly in the gear 93 and the inner race fits over the end of the shaft 19. This construction supports one end of the shaft 85 on the shaft 19 so that the two shafts are concentric and the shaft 19 is free of com tact with the tubular shaft 85.

Fixed to the other end of the shaft 19 is the offset hub 88 of a disk 89 and fitted in the hub 89 is a ball bearing 90 which supports the other end of the shaft 85. Fixed to the end of the shaft 85 is the hub of a disk 9| which carries' take-up elements 92 and a guard ring 93. It will be observed that the disk 89 is Offset (Fig. 8) so that the smaller disk 9| is arranged in the same plane as the disk 89. The disk 89 carries take-up elements 94 and a thread guard ring 95.

The pulleys and gearing are arranged so that the shafts I9 and 85 rotate at the same speed as the needle-bar shaft 15. Also, the shaft 19 rotates in the same directions as the needlebar shaft and the shaft 85 rotates in the oppo site direction. The feeding mechanism, hook and hook actuating mechanism are the same as those shown and described in the machine illustrated in Figs. 1-6.

As illustrated in Fig. 10 the lead of the thread is from the source of supply to the thread tension 91 thence to the guide 99, over the take-up elements 92 and 94, to guide 99 and then the needle I00. In the position shown in Figure 10 the hook I 8| is nearing its cast off point and the take-up elements have been giving up thread so that the hook llil could expand the needle-loop. At this point in the stitch-forming cycle the takeup elements are just completing a comparatively slow thread give up action on the needle-thread and are about to begin their fast thread take-up action. Fig. 11 illustrates the position of the take-up elements at the stitch setting point in the cycle, the take-up elements having moved from the position illustrated in Fig. 10 to that illustrated in Fig. 11 to take up the expanded needle-loop and set the stitch.

From the foregoing it will be seen that the take-up elements rotate in the same vertical plane at the same speed and at uniform angular velocities. The rotation of the disks in opposite directions causes one of the disks to modify the action of the other disk and thereby produce a slow give-up action which will control the needlethread as it is being expanded by the hook and a quick take-up action for pulling up the needle loop and setting the stitch.

Having thus set forth the nature of the invention what I claim herein is:

1. A needle thread take-up for sewing machines comprising a plurality of thread-engaging elements and means for rotating said elements in opposite directions each at a uniform angular velocity.

2. A take-up for sewing machines comprising a plurality of rotary take-up elements operable about fixed axes, means for rotating said elements in opposite directions and at a uniform angular velocity and means to guide a thread to said elements in series relation and in the plane of operation of said elements.

3. A take-up for sewing machines comprising a pair of rotary take-up elements operating about spaced axes, and means for actuating one of said elements in a clockwise direction and the other of said elements in a counterclockwise direction and at uniform angular velocities.

4. A take-up for sewing machines comprising a plurality of'rotary take-up elements operating about spaced axes and acting on the same thread and means for actuating said elements in opposite directions and each at a uniform angular velocity.

5. In a sewing machinethe combination of a reciprocatory thread-carrying needle and a complemental loop-taker of a. plurality of cyclically operable rotary take-up elements operable about different axes means for actuating at a uniform angular velocity one of said element in a clockwise direction and the other of said elements in a counterclockwise direction.

6. In a sewing machine, the combination with a reciprocatory thread-carrying eye-pointed needle and a complemental book which makes more than one complete rotation for each needle reciprocation, of a' plurality of cyclically operable take-up devices for the thread of said needle and means for concomitantly actuating them in from, and means for rotating said shafts at a uniform angular velocity in opposite directions.

11. A take-up for a sewing machine having a rotating needle-bar actuating shaft and a reciprocatory needle cooperating with a rotary hook to form lock stitches comprising, a pair of coaxial shafts arranged parallel to the needle-bar actuating shaft, means for actuating said shafts in opposite directions, and take-up elementscarried by said shafts and arranged to act conjointly on the same needle thread.

12. A take-up for a sewing machine having a rotating needle-bar actuating shaft and a reciprocatory needle cooperating with a rotary hook to form lock stitches comprising, a pair of coaxial shafts arranged parallel to the needle-bar actuating shaft, means for actuating said shafts in opposite directions, and take-up elements fixed to said shafts and arranged in the same vertical plane, said elements being adapted to act on the same needle-thread once during each stitchforming cycle.

13. A take-up for a sewing machine having a rotating needle-bar actuating shaft and a reciprocatory needle cooperating with a rotary hook to form lock stitches comprising, a pair of coaxial shafts arranged parallel to the needle-bar acdifferent directions and at a uniform angular 8. A take-up for sewing machines comprising a plurality of take-up elements operable about the same axis and each at a fixed distance therefrom, and means for rotatingv such elements about said axis in opposite directions and at a uniform angular velocity.

9. A take-up for sewing machines comprising a plurality of nested disks adapted for rotation in the same plane, take-up elements carried by said disks and means for rotating said disks in opposite directions at a uniform angular velocity.

10. A take-up for sewing machines comprising a plurality of take-up shafts, take-up elements carriedby said shafts at a fixed distance theretuating shaft, means for actuating said shafts in opposite directions, disks carried by said shafts and arranged in the same vertical plane, and thread-engaging pins carried by said disks.

14. A. take-up for a sewing machine having arotating driving shaft and a rotating hook which cooperates with an eye pointed needle to produce lock-stitches comprising, a pair of parallel take-up actuating shafts, means for connecting one of said shafts to the driving shaft whereby it is rotated in the same direction as the driving shaft and separate means for operatively connecting the other shaft to the driving shaft whereby it is rotated in a direction opposite to I the driving shaft, and a take-up element actuated by each of said shafts, said take-up elements adapted to act conjointly on the same thread.

15. A take-up for a sewing machine having a rotating shaft for actuating an eye-pointed needle, a disk having its axis coincident with said' shaft and actuated thereby, a second shaft, means for actuating said second shaft at the same speed and in the opposite direction from the first mentioned shaft, a disk on said second shaft and take-up elements carried by said disks and adapted to act conjointly on the needle-thread.

16. In a sewing machine, the combination with a reciprocatory thread-carrying eye-pointed needle and a complemental hook which makes more than one complete rotation for each needle reciprocation, of a plurality of cyclically operable take-up elements for the needle-thread and means for rotating said take-"up elements at the same speed, at a uniform angular velocity and in different directions.

FRANK PARRY. 

